It is fantastic that a company operating with such horrific practices is dead. While we are at it, when can we fix similar issues below with mainstream financial systems that millions of people are still using? - Social security numbers are used as a secret for identification, despite being in plaintext and having so low entropy as to be guessable, and originally issued on a card literally saying "Not for Identificat…
A check is simply a contract -- a promissory note. Like any contract you wouldn't sign it with someone you didn't trust, right?
(Obviously that statement, while true, is risable these days. But I remember a Bogart film in which he was setting a debt at a casino so asked the owner for a check -- he filled in not only the amount but his name, address and bank).
All the info on your check is just printed there as a convenience to you, or at least used to be. Until ~20 years ago physical checks were still sent back to your bank where they would check the signature, which could take a while! I think since the 72 hour rule went into place (and sending checks physically no longer allowed) the format was set by regulation